package com.yuehuanghun.admin.core.controller.common;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.codec.binary.Base64;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cache.CacheManager;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.google.code.kaptcha.Producer;
import com.yuehuanghun.admin.core.config.constant.CacheKeys;
import com.yuehuanghun.framework.exception.BizException;
import com.yuehuanghun.framework.util.IdUtils;

/**
 * 验证码操作处理
 * 
 * @author yadmin
 */
@RestController
public class CaptchaController {
	@Resource(name = "captchaProducer")
	private Producer captchaProducer;

	@Resource(name = "captchaProducerMath")
	private Producer captchaProducerMath;

	// 验证码类型
	@Value("${system.captchaType}")
	private String captchaType;

	@Autowired
	private CacheManager cacheManager;

	/**
	 * 生成验证码
	 */
	@GetMapping("/captchaImage")
	public Map<String, Object> getCode(HttpServletResponse response) throws IOException {
		// 保存验证码信息
		String uuid = IdUtils.simpleUUID();

		String capStr = null, code = null;
		BufferedImage image = null;

		// 生成验证码
		if ("math".equals(captchaType)) {
			String capText = captchaProducerMath.createText();
			capStr = capText.substring(0, capText.lastIndexOf("@"));
			code = capText.substring(capText.lastIndexOf("@") + 1);
			image = captchaProducerMath.createImage(capStr);
		} else if ("char".equals(captchaType)) {
			capStr = code = captchaProducer.createText();
			image = captchaProducer.createImage(capStr);
		}

		cacheManager.getCache(CacheKeys.CAPTCHA_CODE).put(uuid, code);
		// 转换流信息写出
		FastByteArrayOutputStream os = new FastByteArrayOutputStream();
		try {
			ImageIO.write(image, "jpg", os);
		} catch (IOException e) {
			throw new BizException(e.getMessage(), e);
		}

		Map<String, Object> result = new HashMap<>();
		result.put("uuid", uuid);
		result.put("img", Base64.encodeBase64String(os.toByteArray()));
		return result;
	}
}
